Initial support for hide and show in import directives

compiler/java/com/google/dart/compiler/ast/ImportHideCombinator.java

Index: compiler/java/com/google/dart/compiler/ast/ImportHideCombinator.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/ImportHideCombinator.java	(revision 0)
+++ compiler/java/com/google/dart/compiler/ast/ImportHideCombinator.java	(revision 0)
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2012, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.dart.compiler.ast;
+
+/**
+ * Instances of the class <code>ImportHideCombinator</code> represent a combinator that restricts
+ * the names being imported to those that are not in a given list.
+ * 
+ * <pre>
+ * importHideCombinator ::=
+ *     'hide:' {@link DartArrayLiteral listLiteral}
+ * </pre>
+ */
+public class ImportHideCombinator extends ImportCombinator {
+  /**
+   * The list of names from the library that are hidden by this combinator.
+   */
+  private DartArrayLiteral hiddenNames;
+
+  /**
+   * Initialize a newly created import show combinator.
+   */
+  public ImportHideCombinator() {
+    super();
+  }
+
+  /**
+   * Initialize a newly created import show combinator.
+   * 
+   * @param hiddenNames the list of names from the library that are hidden by this combinator
+   */
+  public ImportHideCombinator(DartArrayLiteral hiddenNames) {
+    this.hiddenNames = becomeParentOf(hiddenNames);
+  }
+
+  @Override
+  public <R> R accept(ASTVisitor<R> visitor) {
+    return visitor.visitImportHideCombinator(this);
+  }
+
+  /**
+   * Return the list of names from the library that are hidden by this combinator.
+   * 
+   * @return the list of names from the library that are hidden by this combinator
+   */
+  public DartArrayLiteral getHiddenNames() {
+    return hiddenNames;
+  }
+
+  /**
+   * Set the list of names from the library that are hidden by this combinator to the given list.
+   * 
+   * @param hiddenNames the list of names from the library that are hidden by this combinator
+   */
+  public void setHiddenNames(DartArrayLiteral hiddenNames) {
+    this.hiddenNames = becomeParentOf(hiddenNames);
+  }
+
+  @Override
+  public void visitChildren(ASTVisitor<?> visitor) {
+    if (hiddenNames != null) {
+      hiddenNames.visitChildren(visitor);
+    }
+  }
+}